Assure Directory

AMS2 by De Beers Group Industry Services

Instrument Description

AMS2 is a desktop fully automated diamond verification instrument. AMS2 is designed to screen large quantities of loose stones at high speed. AMS2 automatically separates diamonds from synthetic diamonds and diamond simulants. AMS2 is suitable for large scale diamond wholesalers, diamond cutting and polishing sites, jewellery manufacturers, and gemmological laboratories.

Instrument Specs

Size: 31.5 cm (W) x 40 cm (D) x 55 cm (H)

Weight: 25 kg

Price: 45,000 USD (February 2019)

View Instrument Details

What Stones Can Be Tested?

Weight of stones: 0.0033 ct-0.20 ct for Round Brilliants

Size of stones: 0.90 mm-3.80 mm for Round Brilliants and 1.00 mm-4.00 mm for fancy cuts

Colour of stones: D-J (failsafe across all colours although natural fancy colours will give a higher referral rate)

Shape of stones: All

Diamond simulants: Yes

Jewellery: No


Capabilities according to De Beers Group Industry Services

Instrument Functionality

Automatically feed the stones? Yes

Automatically interpret the results? Yes

Automatically dispense the stones? Yes

Detect or refer synthetic diamonds? Detect

Detect or refer diamond simulants? Detect

Multiple stones at one time? Yes

Training? No

How Does it Operate?

The user loads up to 500 ct of loose polished stones into the AMS2 in a specific size range. The instrument then automatically processes the stones and dispenses them into their respective category.


AMS2 dispenses the stones into four categories:

  1. ‘Pass’ i.e. diamond
  2. ‘Synthetic’
  3. ‘Non-Diamond’
  4. ‘Refer’


The refers could contain potential synthetic diamonds and diamonds. The referrals shall be tested further for full verification. De Beers Group Industry Services recommends further testing with the DiamondView or by a gemmological laboratory.


AMS2 needs to be calibrated periodically to ensure continued high performance. The user will be notified by the software when the calibration needs to be carried out. A calibration tool is supplied with each instrument and a series of calibration steps is incorporated into the instrument’s software.

What are the Performance Test Results?

AMS2 was tested in accordance with the Diamond Verification Instrument Standard with the test protocol for instruments that separate diamonds, synthetic diamonds and diamond simulants (Operation Category 3).


The tests took place at the independent laboratory UL in Canton, Massachusetts, United States.


AMS2 was tested with the ASSURE Core Sample that consists of 1,000 diamonds, 200 synthetic diamonds and 200 diamond simulants. The stones are 0.02 ct to 0.20 ct in D-J colour. The below results are from the test with the ASSURE Core Sample.


The tests were performed by a novice operator.


The summary test report issued by UL can be found here.


Diamond False Positive Rate Ratio of synthetic diamonds (and diamond simulants) incorrectly classified as 'diamond' to the total number of synthetic diamonds (and diamond simulants) 0%
Diamond Referral Rate Ratio of diamonds being referred for further testing to the total number of diamonds 0.7%
Diamond Accuracy Ratio of diamonds correctly classified as diamonds to the total number of diamonds 99.1%
Speed Stones tested per hour 2,677
Where Do I purchase the Instrument?

Website: https://www.iidgr.com/innovation

Email: info@iidgr.com

Phone: +44 207 858 7887

Safety Testing

The most important requirement when selecting a Diamond Verification Instrument is that the instrument meets the safety regulations of your local jurisdiction. Before purchasing an instrument, request that the manufacturer verifies that their instrument complies with all regulatory requirements.


Click here to download the safety testing credential for AMS2 submitted by De Beers Group Industry Services. Please note that the safety testing credentials have not been validated through the ASSURE Program.